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English to Polish translations [PRO] Tech/Engineering - Other
English term or phrase:barlow
A barlow is an eyepiece which goes between the telescope
and the normal eyepiece. They change the focal ratio of the telescope.
Barlows come in 1.5x, 2x, 3x, 4x, and 5x. If you have a a focal ratio telescope of F/6, using a 2x Barlow will make it a F/12 (2x6). Barlows are epecially useful for getting high magnifications out of short focal ratio telescopes as eyepieces can only be made so short in focal length (4mm is the shortest).